Microthyriacites sp. (Fig. 13Q)

OCCURRENCE. — Ashikajima and Kimigahama Fm.

DESCRIPTION

Disc-like body, brown-colored, with radially arranged cell rows; the margins of the body are thin and irregular. The “ostiole” is not distinct, but a hole in the center of the disc is present, formed by dissolving of the central cells. Cells are square to elongated, without pore, 3-10 µm long and 2.5 µm wide. Cells of the central part of the disc are thicker. Equatorial diameter = 65-70 µm.

BOTANICAL AFFINITIES

Dothideomycetes, Microthyriales . Epiphyllous fungi.